strspn, strcspn - get length of a prefix substring
#include <string.h> size_t strspn(const char *s, const char *accept); size_t strcspn(const char *s, const char *reject);
The strspn() function calculates the length (in bytes) of the initial segment of s which consists entirely of bytes in accept. The strcspn() function calculates the length of the initial segment of s which consists entirely of bytes not in reject.
The strspn() function returns the number of bytes in the initial segment of s which consist only of bytes from accept. The strcspn() function returns the number of bytes in the initial segment of s which are not in the string reject.
For an explanation of the terms used in this section, see attributes(7). Interface Attribute Value strspn(), strcspn() Thread safety MT-Safe
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
index(3), memchr(3), rindex(3), strchr(3), string(3), strpbrk(3), strsep(3), strstr(3), strtok(3), wcscspn(3), wcsspn(3)
This page is part of release 4.09 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2015-08-08 STRSPN(3)
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